how to write BMI formula in crystal reports..below my code

Question

Anyone can help me how to write BMI formula in crystal reports 10. I want to display numeric value like 55.5.

Here is my code...

If {TableName.Weight}<>'' and {TableName.Height}<>'' then

(IF NumericText({TableName.Weight}) and NumericText({TableName.Height}) then

(If ToNumber({TableName.Weight})>0 and ToNumber({TableName.Height})> 0

then ((ToNumber({TableName.Weight})/ToNumber({TableName.Height}))/ToNumber({TableName.Height}))*10000;))